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(and ...) combinator in patterns

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This commit is contained in:
Chris Fallin
2021-09-07 00:47:03 -07:00
parent 602b8308ce
commit 1ceef04680
6 changed files with 61 additions and 7 deletions
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22
cranelift/isle/src/parser.rs
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@@ -305,13 +305,23 @@ impl<'a> Parser<'a> {
}
} else if self.is_lparen() {
self.lparen()?;
let sym = self.parse_ident()?;
let mut args = vec![];
while !self.is_rparen() {
args.push(self.parse_pattern()?);
if self.is_sym_str("and") {
self.symbol()?;
let mut subpats = vec![];
while !self.is_rparen() {
subpats.push(self.parse_pattern()?);
}
self.rparen()?;
Ok(Pattern::And { subpats })
} else {
let sym = self.parse_ident()?;
let mut args = vec![];
while !self.is_rparen() {
args.push(self.parse_pattern()?);
}
self.rparen()?;
Ok(Pattern::Term { sym, args })
}
self.rparen()?;
Ok(Pattern::Term { sym, args })
} else {
Err(self.error(pos.unwrap(), "Unexpected pattern".into()))
}